The main reason why distillation works so well with water is because water has a lower boiling point than most solid minerals and other contaminants. What about liquid contaminants? What about pesticides and other chemical additives?

Unfortunately, these substances have lower boiling points than water.
This means they evaporate first. Instead of just having pure water vapor, you’re left with contaminated water vapor that doesn’t get any purer even after condensation.

If you suspect your water to have been contaminated by pesticides and such, distillation may not be the best method of treating your water as it will not get rid of the contaminants.

On top of that, distillation, however efficient, does not discriminate between good and bad guests in the water.
Distilling water also runs the risk of removing healthy minerals in the water. Some examples of these good substances are sodium, chloride and potassium.

Your body needs these substances to process the water and make good use of it. You’re also losing out on plenty vitamins and minerals that naturally make water the perfect beverage.